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$512+ Cheap flights from Heathrow (LHR) to Philadelphia (PHL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PHL
May 20 — May 271
Tue 5/20
Tue 5/27
1 adult, Economy
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Find cheap flights from Heathrow to Philadelphia with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from London Heathrow to Philadelphia are usually found in March or February, booked 79 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from Heathrow to Philadelphia

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Philadelphia (PHL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 15, 2025.

Most accurate provider

Gurufare
3 stars

Most trusted provider

Gurufare
3 stars

Round-trip from

$512
(ChecknFly)

Popular in

July

Cheapest in

March

Average price

$719

Good round-trip deal

$785 or less

Good one-way deal

$699 or less
Provider with most accurate pricing for London Heathrow-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for London Heathrow-Philadelphia flights.
Search Deals
From London Heathrow to Philadelphia
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($112 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($16 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2025
Search Deals
Price to beat on a round-trip flight from London Heathrow to Philadelphia.
Search Deals
Price to beat on a one-way flight from London Heathrow to Philadelphia.
Search Deals

Find flight deals from Heathrow to Philadelphia

Cheapest flights from Heathrow to Philadelphia
Explore the most affordable flight options available from Heathrow to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 15, 2025.

This ChecknFly deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/202:10 pmLHR - PHL
1 stop26h 46mLufthansa
Sun 9/213:25 pmPHL - LHR
1 stop10h 05mLufthansa
Deal found 5/15$512
This United Airlines deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/208:30 amLHR - PHL
1 stop30h 20mUnited Airlines
Sun 9/215:35 pmPHL - LHR
1 stop14h 05mUnited Airlines
Deal found 5/15$517
This JetBlue deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/128:25 amLHR - PHL
1 stop15h 17mJetBlue
Tue 9/233:00 pmPHL - LHR
1 stop10h 30mJetBlue
Deal found 5/15$552
This TravelUp deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/217:50 amLHR - PHL
1 stop11h 05mBritish Airways
Mon 11/243:35 pmPHL - LHR
1 stop10h 25mBritish Airways
Deal found 5/15$561
This Gotogate deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/216:50 amLHR - PHL
2 stops13h 00mAir Canada
Mon 11/243:30 pmPHL - LHR
1 stop10h 40mAir Canada
Deal found 5/15$571
This Air Canada deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/206:50 amLHR - PHL
2 stops12h 48mMultiple Airlines
Sun 9/213:25 pmPHL - LHR
1 stop10h 05mMultiple Airlines
Deal found 5/15$579
This American Airlines deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/76:15 amLHR - PHL
1 stop14h 30mAmerican Airlines
Thu 6/191:55 pmPHL - LHR
1 stop12h 00mAmerican Airlines
Deal found 5/15$617
This lastminute.com deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/229:40 amLHR - PHL
1 stop16h 51mVirgin Atlantic
Wed 5/285:57 pmPHL - LHR
1 stop11h 33mVirgin Atlantic
Deal found 5/15$627
This Delta deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1111:45 amLHR - PHL
2 stops14h 51mDelta
Sat 6/216:08 amPHL - LHR
1 stop23h 22mDelta
Deal found 5/15$636
This Kiwi.com deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/86:35 amLHR - PHL
1 stop14h 50mFinnair
Thu 6/1910:15 pmPHL - LHR
Nonstop7h 05mFinnair
Deal found 5/15$659
This Kiwi.com deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/107:45 amLHR - PHL
1 stop13h 00mIberia
Tue 6/177:50 pmPHL - LHR
Nonstop7h 15mIberia
Deal found 5/15$679
This The Travel House deal was found by Cheapflights users on 5/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/258:25 amLHR - PHL
1 stop29h 12mIcelandair
Fri 5/3010:16 amPHL - LHR
2 stops29h 29mIcelandair
Deal found 5/15$681

Cheapflights Fare Finder

Customize your flight search to find flights from Heathrow to Philadelphia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 15, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Philadelphia that are best for you.

Fly from

Heathrow

Fly to

Philadelphia

Route

Depart

Return

Price

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 9/20

2:10 pm-11:56 am

1 stop26h 46m

Philadelphia

Sun 9/21

3:25 pm-6:30 am

1 stop10h 05m

$512

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 9/20

8:30 am-9:50 am

1 stop30h 20m

Philadelphia

Sun 9/21

5:35 pm-12:40 pm

1 stop14h 05m

$517

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Fri 9/12

8:25 am-6:42 pm

1 stop15h 17m

Philadelphia

Tue 9/23

3:00 pm-6:30 am

1 stop10h 30m

$552

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Mon 9/1

1:25 pm-7:00 pm

1 stop10h 35m

Philadelphia

Mon 9/15

6:35 pm-9:35 am

1 stop10h 00m

$569

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 9/20

6:50 am-2:38 pm

2 stops12h 48m

Philadelphia

Sun 9/21

3:25 pm-6:30 am

1 stop10h 05m

$579

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 6/11

2:05 pm-10:06 pm

1 stop13h 01m

Philadelphia

Mon 6/16

7:30 am-6:35 am

1 stop18h 05m

$581

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 6/7

6:15 am-3:45 pm

1 stop14h 30m

Philadelphia

Thu 6/19

1:55 pm-6:55 am

1 stop12h 00m

$617

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sat 6/14

10:55 am-10:54 pm

2 stops16h 59m

Philadelphia

Sat 6/21

2:05 pm-11:25 am

2 stops16h 20m

$635

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Wed 6/11

11:45 am-9:36 pm

2 stops14h 51m

Philadelphia

Sat 6/21

6:08 am-10:30 am

1 stop23h 22m

$636

LondonPhiladelphia

LHR - PHL

LHRPHL

London Heathrow

Sun 6/8

6:35 am-4:25 pm

1 stop14h 50m

Philadelphia

Thu 6/19

10:15 pm-10:20 am

Nonstop7h 05m

$659

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/14

Showing 1-10 of 31 results
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Compare providers for flights from Heathrow to Philadelphia

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Heathrow to Philadelphia in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars
Thrive TravelPrice Accuracy3 starsTrust Score*2 stars
Kiwi.comPrice Accuracy3 starsTrust Score*3 stars
GurufarePrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
oojoPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London Heathrow Airport-Philadelphia flights, users find the pricing of Gurufare to be most consistent on Cheapflights vs. Gurufare Users can find the same prices on London Heathrow Airport-Philadelphia flight deals on Cheapflights vs. Gurufare >95% of the time. Price accuracy is based on data collected from London Heathrow Airport-Philadelphia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London Heathrow Airport-Philadelphia flights, Cheapflights users trust Gurufare the most. Gurufare has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London Heathrow Airport-Philadelphia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for London Heathrow Airport to Philadelphia flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Philadelphia trip
Airports
LHR

For a smooth departure, ensure all liquids are in one small bag to avoid lengthy security checks at Heathrow.

Read more about LHRby Ramsey Qubein
PHL

For a quick trip to Center City, use the SEPTA Airport Line. It's efficient and operates from 5:00 a.m. to midnight.

Read more about PHLby Mark Chesnut
Our travel experts
Mark Chesnut

Mark Chesnut

Expert on PHL

Mark Chesnut

Mark Chesnut

Mark Chesnut is a travel writer and public speaker with more than 30 years of experience. The 2019 winner of the NLGJA Excellence in Travel Writing Award, Mark is the author of the book “Prepare for Departure” and has covered air travel for multiple top consumer and trade media outlets.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Best time to book a flight from Heathrow to Philadelphia

Have a flexible travel schedule? Discover the best time to fly to Philadelphia from Heathrow with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from London Heathrow Airport to Philadelphia

How far ahead should I book a flight from London Heathrow Airport to Philadelphia?

Use this chart to determine the optimal time to book a round-trip flight from Heathrow to Philadelphia. Price data was last updated on May 9, 2025.

The best time to book flights from London Heathrow Airport to Philadelphia is 79 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from London Heathrow Airport to Philadelphia?

Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to Philadelphia (average of $236). Flying from London Heathrow Airport to Philadelphia in March is currently the most expensive (average of $295). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from LHR to PHL?

Find hourly flight availability from Heathrow to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 15, 2025.

When flying from London Heathrow Airport to Philadelphia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 45% versus a flight in the morning.

Weekly flight availability from London Heathrow Airport to Philadelphia

Explore weekly flight availability from Heathrow to Philadelphia. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 15, 2025.

The most flights from LHR to PHL are scheduled on a Monday (15 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (14 on average).

Rainfall in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

Temperature in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Philadelphia. Reviews last updated May 15, 2025.
To help decide which airline to fly from London to Philadelphia, see what other customers have to say about Delta, Finnair and SWISS. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,946 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,279 reviews
Delta
8.0
Very good
7,946 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,595 reviews
Delta
8.0
Very good
7,946 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,731 reviews
Delta
8.0
Very good
7,946 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
644 reviews
Delta
8.0
Very good
7,946 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Entertainment

7.9

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Philadelphia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Philadelphia from London Heathrow?

    Most people fly into Philadelphia (PHL) if they book a flight to Philadelphia from London Heathrow. On average, Philadelphia has 14 inbound flights from London Heathrow per day from 5 airlines. Philadelphia is conveniently located just 7.0 mi from Philadelphia’s city center.

  • What are the cheapest airlines flying from London Heathrow Airport to Philadelphia round-trip?

    Flying on Lufthansa is currently your cheapest option to Philadelphia, with prices starting at $512. Additional round-trip tickets that might be worth considering are offered by United Airlines and JetBlue, with the lowest prices starting at $517 and $552, respectively. Lufthansa is currently priced 32% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London Heathrow Airport to Philadelphia one-way?

    To fly one-way, consider booking your trip with Aer Lingus, which is currently one of the cheapest options available, starting at $558. Finnair flights start at $561 while deals on Iberia start at $564 one-way.

  • What are the most reliable airlines from London Heathrow Airport to Philadelphia?

    Before booking your flight to Philadelphia from London Heathrow Airport, check out the most reliable airlines to get you to your destination on time: Aer Lingus (82%), American Airlines (79%), Finnair( 79%).

  • What are the cheapest flights from London Heathrow Airport to Philadelphia?

    Looking for the cheapest flight from London Heathrow Airport to Philadelphia? While on average our users pay $1,172, our data indicates the cheapest price to be $646. The most popular route (London Heathrow - Philadelphia), is priced around $186.

  • Can I find deals for flights from Heathrow to Philadelphia that include hotel bookings?

    Yes. In addition to deals on Heathrow to Philadelphia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Philadelphia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Philadelphia.

  • Can I find deals for business class flights from Heathrow to Philadelphia?

    Yes. Cheapflights offers flight deals from Heathrow to Philadelphia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London Heathrow Airport to Philadelphia?

    Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to Philadelphia (average of $236). Flying from London Heathrow Airport to Philadelphia in March is currently the most expensive (average of $295). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Vineland
Pottstown
Wildwood
Reading
King of Prussia
Cherry Hill
Exton
Ocean City
Essington
Chester
Middletown
Willow Grove
Newark
Millville
Dover
Ephrata
Camden
Dewey Beach
Glen Mills
Springfield

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Alternative routes for Heathrow to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
Heathrow to John F Kennedy Intl flights
Heathrow to Newark flights
Gatwick to John F Kennedy Intl flights
Heathrow to LaGuardia flights
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Gatwick to LaGuardia flights
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Stansted to John F Kennedy Intl flights
Heathrow to Dulles Intl flights
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Luton to Dulles Intl flights
Gatwick to Philadelphia flights
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Stansted to Dulles Intl flights
Heathrow to Pittsburgh flights
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Luton to Philadelphia flights
Luton to LaGuardia flights
Gatwick to Pittsburgh flights
Southend to John F Kennedy Intl flights
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Top 5 airlines flying from Heathrow to Philadelphia

Discover the top 5 airlines that operate flights from Heathrow to Philadelphia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$583Average$815FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$596Average$800FlexibilityNo cancel feeOn-time71%
IberiaCheapest$644Average$859FlexibilityNo cancel feeOn-time77%
FinnairCheapest$648Average$773FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$662Average$1,223FlexibilityNo cancel feeOn-timeN/A

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